Season 2 begins to deal with character development, including Sheldon becoming more and more obsessive. Leonard Hofstadter and Pennyâ€™s relationship takes a turn for the worse when they break up, but quickly is resolved. Soon their relationship progresses into a stronger friendship than before, while Sheldon Cooper and Pennyâ€™s friendship slowly begins. In the season finale Penny hints at her true feelings for Leonard. Howardâ€™s character remains similar to that of season one in his attempts to seduce women, managing to start a short-lived sexual relationship with Leslie Winkle in the second half of the season. Meanwhile, Rajesh manages to briefly apologize to Penny for what he did in â€œThe Griffin Equivalencyâ€ without having consumed alcohol.

The Big Bang Theory season 2 episodes list:

Episode #1:
The Bad Fish Paradigm (air date: 2008-09-22)

Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.